refi64
commented
8 years ago Have you tried using the debug mode? It prints the Python code that Pyth generates; I personally find it really helpful.
The docs say for m:
Python 2 map. Int as second arg -> range(
). implicit lambda, d -> k -> b ->
That means that map's works just like in Python, but the lambda is implicit; it takes an argument d. The ->s are for if you have nested maps; the outermost will take d, the next will take k, etc.
For instance, this:
mdQis compiled to:
imp_print(Pmap(lambda d:Z,urange(T)))Maybe you can see how it works now.
Note that, in your example, this isn't that helpful on its own. I feel like Pyth has a builtin that returns a list of tails, but I can't find it now...
Pwntheon
isaacg1
I've been trying to learn Pyth, and so far i've completed a couple of golfing challenges. However i've arrived at a place where i can't seem to progress because i (think i) need to use map and/or lambda and i can't figure out how.
So i have this list of numbers in an array, representing stock prices over time. I need to find the maximum profit you can make by buying at one point and selling at a later point, only once.
In pseudocode i want to do this: for each number in the list: (this is where i think map might help) add the difference between this number and each of the remaining numbers to a list
sort the list, output tail.
I tried using a loop, but couldn't figure out how to get the index so i could compare to "the rest of the list". I figured i might use map, but i can't seem to figure out how to use it, and whether i had to define a function first (and how).